Creating talk Page - Enjoy! :) Drbogdan (talk) 16:12, 18 December 2012 (UTC)
Video Template talk:Age in sols
Sols on Mars - Wikipedia notes *1-SOL LESS* than NASA?
Perhaps relevant discussion? - Enjoy! :) Drbogdan (talk) 17:54, 18 December 2012 (UTC)
Copied from the Talk:Curiosity_rover#Sols_on_Mars_-_Wikipedia_notes_.2A1-SOL_LESS.2A_than_NASA.3F:
Maps Template talk:Age in sols
Sols on Mars - Wikipedia notes *1-SOL LESS* than NASA?
Seems the Curiosity rover landing on Mars occurred officially on "August 6, 2012 05:17 UTC"< ref name ="Space-20120806">Wall, Mike (August 6, 2012). "Touchdown! Huge NASA Rover Lands on Mars". Space.com. Retrieved December 14, 2012. </ref> - using "August 6, 2012" in the Wikipedia template for "Sols on Mars" => { {age in sols|2012|08|06}} seems to give "2029 Sols", a number that is *1-SOL LESS* than that given on the official onsite NASA Counter - explanation(s) welcome of course - TIA - Enjoy! :) Drbogdan (talk) 15:34, 15 December 2012 (UTC)
- To quote the template documentation:
- This template was created for use on Mars mission pages, NASA ones in particular, which identify mission milestones based on the mission sol which begins with sol 0 on the landing date for rover and landers and the orbital insertion date for orbiters. Examples include:
- This template is useful for converting any span of Earth days into the appropriate number of sols with precision of ~ +/- 1 sol due because it rounds to the nearest sol.
- I think that explains the discrepancy. We're currently at sol 130, but still closer to 129 than to 130 sols away from the the sol we had at noon of August 6, 2012. --Julian H. (talk) 16:45, 17 December 2012 (UTC)
- @Julian H. - Thank you for your comment - yes, this helps - seems I should have considered the template description earlier - Thanks again - and - Enjoy! :) Drbogdan (talk) 17:51, 17 December 2012 (UTC)
- I tried to get a precise result, but it's far away from the clock on the NASA site:User:Julian_Herzog/sandbox#Age in sols. I really don't know how they calculate this.--Julian H. (talk) 20:02, 17 December 2012 (UTC)
- Thanks for trying - perhaps the NASA Mars "sols" clock *could be* in error?- after all, I recently helped the NASA Staff correct several errors in a recent image description on the NASA WebSite (compare incorrect "Aug 10" with similar correct "Dec 10") - in any case - decided to link the word "sols" in the Curiosity rover info box with the http://mars.jpl.nasa.gov/msl/ WebSite - might be easier to compare the two determinations for "sols" - ok to rv/mv/ce of course - Enjoy! :) Drbogdan (talk) 04:54, 18 December 2012 (UTC)
- FWIW - Seems the official NASA Mars Timekeeping Clocks, titled "MARS24", is available for download at => http://www.giss.nasa.gov/tools/mars24/ - the "NASA Mars Clocks" includes the "Curiosity Rover" Mission Timer and much more - also available is the mathematical basis for the "NASA Mars Clocks" (at http://www.giss.nasa.gov/tools/mars24/help/algorithm.html) and to other related technical informations (at http://www.giss.nasa.gov/tools/mars24/help/) - hope this helps in some ways - Enjoy! :) Drbogdan (talk) 15:28, 18 December 2012 (UTC)
NOTE: Several relevant comments from a recent (12/19/2012) email correspondence with NASA are below:
- the NASA Mars Clock (at http://mars.jpl.nasa.gov/msl/) and the"MARS24" program (at http://www.giss.nasa.gov/tools/mars24/) are not "official" NASA Mars Clocks, may give similar times and may be "off by some odd amount" (by "1 or 2 seconds" at last look?) from the true official Mars Clock "kernel" - (the "official 'kernel' [is] maintained at JPL").
- the "Curiosity mission clock starts from mean local solar midnight immediately preceding touchdown, and for the midnight at the originally planned landing longitude and not the actual landing longitude. As MSL touched down mid afternoon local time, a clock started at the time of touchdown would lag between the mission clock by about 15 Mars hours." [use SpaceCraft Event Time (SCET) rather than Earth Received Time (ERT) which may be "off by about 14 minutes"].
- in summary, "if you plug the time and date UT 2012-08-05 13:50:00 into an MSL timekeeping calculation, you should obtain that it is mission time 00:00 on Sol 0. If you're off by a second or two, you're doing as well as Mars24. If you're off by about 7-8 seconds, you may be using the landing longitude in the calculation rather than the planned longitude. If you're off by about 14 minutes, then you probably have ERT rather than SCET."
Hope the above is helpful in some way - in any regards - Enjoy! :) Drbogdan (talk) 17:57, 19 December 2012 (UTC)
- Perfect, that explains it. Thanks. I replaced the clock with a timer that is in compliance with NASA now.--Julian H. (talk) 19:34, 19 December 2012 (UTC)
- @Julian H. - Thank you *very much* for your newly created template re the "Mars Curiosity Rover Mission Timer" - yes, the "Sols Count" now seems to be better - and more consistent with the NASA Mars Clock (as well as the NASA MARS24 Program) - Thanks again for your efforts - it's *very much* appreciated - Enjoy! :) Drbogdan (talk) 23:39, 19 December 2012 (UTC)
Source of the article : Wikipedia
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